Is a strip a loose ball?

[Suudy]

I was discussing a scenario with some other officials, and we are stumped on the enforcement.

1st and 10 on A's 30. A9 drops back to pass. During the drop-back, B51 grabs and pulls A69's facemask at the A25. B51 strips the ball from A9 at the A20, and runs for a touchdown.

We can't figure out the spot of enforcement.

Is it a loose ball play? I argued that it was since there was a change of possession, thus the enforcement is from the A30. 1st and 10 on A's 45.

If not, then the end of the run is the A20. Since the foul occurred at the A25, we have 1st and 10 at the A40.